It should be removed regularly by a dentist or dental hygienist; if neglected, it can cause bacteria to lodge between the gums and the teeth, causing gum infection, dental caries, loosening of the teeth, and other disorders. Called also tartar. gastric calculus gastrolith. intestinal calculus enterolith. lung calculus a hard mass or concretion formed in the bronchi around a small center of inorganic material, or from calcified portions of lung tissue or adjacent lymph nodes. Called also pneumolith.
1 Second, your graduation announcement should include the important details of who, what, when, where, and why. 2  This information lets the recipient know what they need to do and by when. 3  If your graduation announcement includes an invitation, RSVP information should be included.
Send Invitation Well in Advance. Some people send graduation announcements that double as an invitation to the ceremony or to a post-ceremony gathering. In this case, the recipient should receive the mail no fewer than two weeks before the date of the event.As such, the time at which you send the announcement depends on the speed of the mail system and the distance to the recipient.The rule of thumb is to send the announcement/invitation four to six weeks before the event.s such, the time at which you send the announcement depends on the speed of the mail system and the distance to the recipient. The rule of thumb is to send the announcement/invitation four to six weeks before the event.